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47 Cards in this Set
- Front
- Back
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C
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Speed of light 186,000 mi/sec
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ly
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distance light travels in one year 6 trillion miles. 12 0's
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au
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average mean distance between earth & sun 93 billion miles 6 0's or 1 au
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the motion of the sun and sky is
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Rotation of the earth on it's axis east to west, sun doesn't move
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The word planet comes from the greek work for "wanderer" what are the names of the 5 naked-eye planets
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Mercury
Venus Mars Jupiter Saturn |
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What is Geocentric Cosmology
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Earth Centered Universe
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Wha is Heliocentric Cosmology
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Sun Centered universe
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Who was Ptolemy
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Greek astronomer/mathmitician made geocentrism through the middle ages
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What is the North Star
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Polaris, which can be located in the little dipper
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What is a constellation
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Imaginary configuration of stars named after person or animal
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Are the constellations seasonal?
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Yes, some stay and some go.
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What is the celestial sphere
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Imaginary sphere of a very large radius that contains the universe
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what is the celestial equator
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the coordinate anagagolous to longitude on earth measured around the equator
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what is declination
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Latitude
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What is right ascension
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Longitude
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what is the ecliptic
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Path of the sun
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The ecliptic crosses the equator at two points known as the equinoxes: true or false
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True
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What are solstices
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Northern and Southern most points on the ecliptic
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The cycles of the Earth, what do they determine?
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Seasons
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What is a light year?
What is it's symbol |
LY - Distance light travels in 1 year
6 trillion miles |
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What is the definition of an astronomical Unit
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AU - 93 million miles
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What is the symbol for the Astronomical Unit
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AU
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What is the symbol for the speed of light?
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C
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What is an arc angle
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the opening of two lines that meet at a point
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What is an angle measure
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Measuring of arc angles
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What is an arc second
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90 degrees - 1 degree angle arcmin 1/3,600 measure of a very tiny angle
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What is stellar parallax
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The apparent displacement of an object against another
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what is the equation used to determine distance to a star?
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D-1/P up to 500 ly
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not until 1838 was the first method invented by German Astrophysicst Friedrich Wilhelm Bessel, to measure distance to a nearby star. What is the method called
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Measurement of parallax
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copernicus put forward what theory of cosmology
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Heliocentric planets orbit aroundt the sun
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Kepler's laws of planetary motion, how many?
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3
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What is Kepler's first law of planetary motion?
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path of the planets are eliptical - nothing at the other end
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what is gravity
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1 of 4 fundamental laws
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Why is the earth round
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Gravity forces it to be so
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Newton's laws of motion, how many?
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3
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Newton's first Law of Motion tells us what?
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Object that rests stays at rest
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What is the formula for Newton's second law of motion?
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F=ma
Force = mass x acceleration |
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ho formulated the law of gravity?
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Newton
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What was the first non naked-eye planet to be discovered?
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Uranus 1781
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Who developed the first reflecting telescope?
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Newton 1668
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the CCD works on what principle
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Light generates electric charge
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Why are telescopes placed in space?
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Because of all the debris
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According to Isaac Newton, What is the true nature of white light
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A form of energy composed of 7 "spectrum of colors"
ROYBGIV |
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Who performed the experiment that discovered the seven primary colors of white light?
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Newton
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what wavelength region of the EM spectrum is taken up by visible light?
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700 nm to 400 nm
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Who discovered the invisible infra-red (or heat) portion of the solar spectrum?
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William Hirshel 1800
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Distance = .772 arc
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1/.547 = 1.83 pc
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